US3284365A - Paint stripping compositions and process - Google Patents

Paint stripping compositions and process Download PDF

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US3284365A
US3284365A US341766A US34176664A US3284365A US 3284365 A US3284365 A US 3284365A US 341766 A US341766 A US 341766A US 34176664 A US34176664 A US 34176664A US 3284365 A US3284365 A US 3284365A
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George P Bourean
James E Maloney
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Detrex Corp
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Detrex Corp
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D9/00—Chemical paint or ink removers

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  • This invention rel-ates to improvements in compositions for the removal of paint from painted surfaces. More particularly it relates to such compositions useful in the caustic stripping of paints from metallic surfaces.
  • halogenated aromatic carboxylic acids having the general formula where X represents a monoor poly-ring substituted halogen radical upon Ar, which represents an aryl radical; the halogenated aromatic sulfonic acids having the general formula XArSO H, where X represents a monoor poly-ring substituted halogen radical upon Ar, which represents an aryl radical; the halogenated nitro substituted sulfo-nic acids having the general formula where X represents a monoor poly-ring substituted halogen radical upon Ar, which represents an aryl radical; and the halogenated aromatic-aliphatic ether compounds having the general formula X--Ar--O--( CH ,,--CO OH
  • An effective caustic based stripping composition in accordance with this invention may be formulated as follows (parts being expressed as percent by weight of an undiluted composition):
  • compositions of this invention are normally solid, and are diluted with water to the extent desired, and preferably at a concentration of at least about five percent solid composition per total weight of the dilute solution. Maximum concentrations are dependent only on solubility and economic factors.
  • the improved halogenated organic acid containing compositions of this invention are superior to former caustic based compositions at all temperatures of use, but are most efiicient when utilized at a boiling temperature.
  • Example 1 A steel panel was coated with one coat of a yellow phenolic coating (Detrex FF-lOO) and bake finished. The panel was partially submerged in a beaker containing a boiling aqueous caustic solution comprising sodium hydroxide at a concentration of two pounds per gallon of solution. After approximately fifteen minutes the coating was completely removed from the panel, however a residue was left on the panel.
  • a yellow phenolic coating (Detrex FF-lOO) and bake finished.
  • the panel was partially submerged in a beaker containing a boiling aqueous caustic solution comprising sodium hydroxide at a concentration of two pounds per gallon of solution. After approximately fifteen minutes the coating was completely removed from the panel, however a residue was left on the panel.
  • Example 2 A steel panel coated in accordance with the specifications of Example 1 was partially submerged in a beaker containing a boiling two pound per gallon solution in water of a stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
  • Example 3 A steel panel coated in accordance with the specifications of Example 1 was partially submerged in a beaker containing a boiling two pound per gallon solution in water of a stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
  • Example 4 A steel panel was coated with one coat of a black enamel (Chrysler, DRE 9201, Detzler) and bake finished. The panel was partially submerged in a beaker containing a boiling aqueous caustic solution comprising sodium hydroxide at a concentration of two pounds per gallon of solution. It required approximately sixteen minutes to completely remove the coating from the submerged portion of the panel.
  • a black enamel Chrysler, DRE 9201, Detzler
  • Example 5 A steel panel coated in accordance with the specifications of Example 4 was partially submerged in a beaker containing a boiling two pound per gallon solution in water of a stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
  • Example 6 A steel panel coated in accordance with the specifications of Example 4 was partially submerged in a beaker containing a boiling t-wo pound per gallon solution in water of a stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
  • the sodium dodecyldiphenyloxide disulfonate is present as a preferred surfactant, yet it may be replaced proportionately by other compatible stable detergents.
  • the sodium gluconate is present as a sequestrant, and may be replaced proportionately by other sequestering agents such as po'lyphosphate compounds, for example.
  • Example 7 Two steel panels were each coated with two coats of an epoxide based paint and bake finished. One panel was partially submerged in a beaker containing a boiling aqueous caustic solution comprising sodium hydroxide at a concentration of one pound per gallon of solution, and the other panel was partially submerged in a beaker containing a similar caustic solution having a sodium hydroxide concentration of two pounds per gallon. The less highly concentrated solution required eighty minutes to poorly strip the paint from the panel, and the more highly concentrated solution required only 35 minutes to strip the paint from the panel, but left a primer residue on the panel.
  • Example 8 Sodium hydroxide 85 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 p-Chlorobenzoic acid 5 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 60 minutes, and the time required for the two pound per gallon solution was 25 minutes.
  • Example 10 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingreclients):
  • Example 11 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingreclients):
  • Example 12 A steel panel, coated in accordance with the specifications of Example 7, was partially submerged in a beaker containing a two pound per gallon concentration in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
  • Example 13 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
  • Example 14 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
  • Example 15 A steel panel, coated in accordance with the specifications of Example 7, was partially submerged in a beaker containing a two pound per gallon concentration in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredient-s) Sodium hydroxide 75 Sodium gluconate 8 Sodium dodecyldiphenyloxide disul'fonate 2 3,4dichlor0benzoic acid 15 Total 100 The paint coating was completely stripped from the submerged portion of the panel in five minutes.
  • Example 16 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
  • Example 17 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as pencent by weight of the undissolved ingredients):
  • Potassium hydroxide 80 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 2,4-dichlorophenoxyacetic acid 10 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 60 minutes, and the time required for the two pound per gallon solution was 6 minutes.
  • Potassium hydroxide 75 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 2,4-dichlorophenoxyacetic acid Total 100 The paint coating was completely stripped from the submerged portion of the panel in five minutes.
  • Example 19 Potassium hydroxide 85 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 2,4,5-tri-chlorophenoxyacetic acid 1 5 Total 100 1 Max. solubility 2-3 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 55 minutes, and the time required for the two pound per gallon solution was 25 minutes.
  • Example 21 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the fol-lowing composition (parts being expressed as percent by weight of the undissolved ingredients):
  • Example 22 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
  • Example 23 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
  • a solid paint stripping composition for use in dilute aqueous solution consisting essentially of a major amount of a caustic alkali metal compound selected from the class consisting of sodium and potassium hydroxide, and an amount in the range of from about five percent by Weight to about forty percent by weight of a halogenated organic acid compound selected from the group consisting of the halogenated aromatic carboxylic acids having the general formula X-Ar-COOH, where X represents a ring substituted halogen radical upon Ar, which represents a phenyl radical; the halogenated aromatic sulfonic acids having the general formula X-Ar-SO H, where X represents a radical selected from the group consisting of monoand poly-ring substituted halogen radical upon Ar, which represents a phenyl radical; the halogenated nitro substituted sulfonic acids having the general formula where X represents a radical selected from the group consisting of monoand poly-ring substituted halogen radical upon Ar, which represents a phenyl
  • composition of claim 1 wherein the halogenated organic acid compound is p chlorobenzoic acid.
  • composition of claim 1 wherein the halogenated organic acid compound is 2,4-dichilorobenzoic acid.
  • composition of claim 1 wherein the halogenated organic acid compound is 3,4-dichlorobenzoic acid.
  • composition of claim 1 wherein the halogenated References Cited by the Examiner UNITED STATES PATENTS 1,095,793 5/1914 Bohn 252-156 1,742,347 1/ 1930 Fries 252-143 2,314,285 3/1943 Morgan 252-156 XR 2,962,395 11/1960 Brown 252- 156 XR 2,969,328 1/1961 Ellenson et -al 252-153 2,971,918 2/196 1 Goldsmith et a1.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Paints Or Removers (AREA)

Description

. rinated diphenols.
United States Patent 3,284,365 PAINT STRIPPING COMPOSITIONS AND PROCESS George P. Bourean, Detroit, Mich, and James E. Ma-
loney, St. Paul, Minn., assignors to Detrex Chemical industries Inc, Detroit, Mich, a corporation of Michigan N0 Drawing. Filed Jan. 31, 1964, Ser. No. 341,766 9 Claims. (Cl. 252-156) This invention rel-ates to improvements in compositions for the removal of paint from painted surfaces. More particularly it relates to such compositions useful in the caustic stripping of paints from metallic surfaces.
This application is a continuation-in-part application of our copending application Serial No. 110,326, filed May 16, 1961, now abandoned.
It is known in the art of metal finishing to remove applied surface coatings such as paints, enamels, japans, lacquers and the like, when necessary, by the application thereto of liquid compositions containing caustic alkali compounds as a major ingredient thereof at elevated temperatures; allowing said compositions to remain in contact with the coating being removed for a sufiicient time to loosen the coating; and then mechanically removing the loosened coating from the surface by liquid sprays, soaking and similar procedures. It is also known to add certain adjuvants to these stripping compositions such as for example phenolic compounds, non-aromatic polyhydroxy compounds, and polyhydroxy aromatic carboxylic acid compounds. In addition, it is common practice to add other components to these stripping compositions such as gluconic acid and derivatives thereof for pigment removal, sequestrants, dust allaying agents and compatible surfactants.
Recent improvements in surface coating formulations have resulted in coatings which are much more satisfactory than prior coating materials with respect to weather resistance, fade resistance and general permanency. These improved coatings, however, have proved far more difficult to remove from coated surfaces which are rejected during the production thereof and undergoing salvage by a paint stripping operation. The cost of salvaging such rejected work is thereby greatly increased, to the extent that in some cases manufacturers are faced with the choice of passing substandard parts or writing off the work invested in perfectly good parts, which may be unacceptable merely because of a poorly applied coating. This problem is particularly serious in the case of the acrylic and epoxide based paints now in susbtantial use. This problem of removing improved surface coatings is also involved in the maintenance of the paint hooks, racks, grates, etc., utilized in the application of surface coatings.
Recently, however, certain new chemical additives have been found to enhance and accelerate the paint stripping characteristics of these earlier developed compositions. Included among these newer additives are the substituted phenolic compounds such as orthophenyl phenol, chlorinated phenols, chlorinated phenyl phenols and chlo- A typical example of such a paint stripping com-position for use in dilute aqueous solution and containing a newer additive is as follows (parts being expressed as percent by weight):
Sodium hydroxide 80 Sodium gluconate 9 O-phenol phenol 10 Sodium d-odecyldiphenyloxide disulfonate 1 Total 3,284,365 Patented Nov. 8, 1966 These just described paint stripping compositions have improved the stripping rate of caustic based stripping solutions to the extent that they will now satisfy most industrial requirements. However, the majority of these additives, since they are in the phenolic class of compounds are becoming undesirable in view of the fact that they create a waste disposal problem of proportions such that many communities will not allow phenolic bodies to be dumped into water sewage because of the consequent effect on stream pollution and water purification. For example, no industrial or commercial type waste may be discharged into the Detroit, Michigan, sewer system which contains phenols in excess of 0.005 ppm.
It is therefore an object of this invention to provide 1mproved compositions for effecting the caustic stripping of surface coatings from metallic surfaces other than aluminum and zinc.
It is another object of this invention to provide such compositions which are effective within very short treatment times.
It is another object of this invention to provide such compositions which are commercially effective on all currently used surface coatings.
It is another object of this invention to provide such compositions whereby during the application thereof, the active components of the compositions will not be distilled from the compositions.
It is another object of this invention to provide such compositions whereby the use of phenolic type additives is avoided.
Other objects and advantages of this invention will readily become apparent from a reading of the following description and claims.
It has now been discovered that the stripping rates of caustic based paint stripping compositions may be greatly enhanced, without the use of phenolic type compounds, by incorporating into said compositions a minor proportion of certain halogenated organic acids. Among those compounds which function satisfactorily to provide the compositions of this invention are the halogenated aromatic carboxylic acids having the general formula where X represents a monoor poly-ring substituted halogen radical upon Ar, which represents an aryl radical; the halogenated aromatic sulfonic acids having the general formula XArSO H, where X represents a monoor poly-ring substituted halogen radical upon Ar, which represents an aryl radical; the halogenated nitro substituted sulfo-nic acids having the general formula where X represents a monoor poly-ring substituted halogen radical upon Ar, which represents an aryl radical; and the halogenated aromatic-aliphatic ether compounds having the general formula X--Ar--O--( CH ,,--CO OH where X represents a monoor poly-ring substituted halogen radical upon Ar, which represents an aryl radical, and n represents a whole integer from 1 t0 4.
An effective caustic based stripping composition in accordance with this invention may be formulated as follows (parts being expressed as percent by weight of an undiluted composition):
Caustic alkali 95.0-75.0 Halogenated organic acid 5.0-25.0
Total 100-100 The compositions of this invention are normally solid, and are diluted with water to the extent desired, and preferably at a concentration of at least about five percent solid composition per total weight of the dilute solution. Maximum concentrations are dependent only on solubility and economic factors. The improved halogenated organic acid containing compositions of this invention are superior to former caustic based compositions at all temperatures of use, but are most efiicient when utilized at a boiling temperature.
The following examples are illustrative of the compositions of this invention.
Example 1 A steel panel was coated with one coat of a yellow phenolic coating (Detrex FF-lOO) and bake finished. The panel was partially submerged in a beaker containing a boiling aqueous caustic solution comprising sodium hydroxide at a concentration of two pounds per gallon of solution. After approximately fifteen minutes the coating was completely removed from the panel, however a residue was left on the panel.
Example 2 A steel panel coated in accordance with the specifications of Example 1 was partially submerged in a beaker containing a boiling two pound per gallon solution in water of a stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide 90 2,4dichlorophenoxyacetic acid 10 Total 100 The time required to completely strip the coating from the submerged portion of the panel was approximately two minutes, and no residue remained after rinsing.
Example 3 A steel panel coated in accordance with the specifications of Example 1 was partially submerged in a beaker containing a boiling two pound per gallon solution in water of a stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide 90 3,4-dich-lorobenzoic acid 10 Total 100 The time required to completely strip the coating from the submerged portion of the panel was approximately three minutes, and no residue remained after rinsing.
Example 4 A steel panel was coated with one coat of a black enamel (Chrysler, DRE 9201, Detzler) and bake finished. The panel was partially submerged in a beaker containing a boiling aqueous caustic solution comprising sodium hydroxide at a concentration of two pounds per gallon of solution. It required approximately sixteen minutes to completely remove the coating from the submerged portion of the panel.
Example 5 A steel panel coated in accordance with the specifications of Example 4 was partially submerged in a beaker containing a boiling two pound per gallon solution in water of a stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide 90 2,4-dichlorophenoxyacetic acid Total 100 The time required to completely strip the coating from the submerged portion of the panel was approximately three minutes.
Example 6 A steel panel coated in accordance with the specifications of Example 4 was partially submerged in a beaker containing a boiling t-wo pound per gallon solution in water of a stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide 3,4-dichlorobenzoic acid 10 Total position):
Caustic alkali 89.5- 63.0 Sodium gluconate 5.0- 10.0 Sodium dodecyldiphenyloxide disulfonate 0.5- 2.0 H-alogenated organic acid 5.0- 25.0
Total l00.0l00.0
The sodium dodecyldiphenyloxide disulfonate is present as a preferred surfactant, yet it may be replaced proportionately by other compatible stable detergents. The sodium gluconate is present as a sequestrant, and may be replaced proportionately by other sequestering agents such as po'lyphosphate compounds, for example.
The following examples are illustrative of effective compositions containing such additional adjuvants:
Example 7 Two steel panels were each coated with two coats of an epoxide based paint and bake finished. One panel was partially submerged in a beaker containing a boiling aqueous caustic solution comprising sodium hydroxide at a concentration of one pound per gallon of solution, and the other panel was partially submerged in a beaker containing a similar caustic solution having a sodium hydroxide concentration of two pounds per gallon. The less highly concentrated solution required eighty minutes to poorly strip the paint from the panel, and the more highly concentrated solution required only 35 minutes to strip the paint from the panel, but left a primer residue on the panel.
Example 8 Sodium hydroxide 85 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 p-Chlorobenzoic acid 5 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 60 minutes, and the time required for the two pound per gallon solution was 25 minutes.
Sodium hydroxide 80 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 p-Chlorobenzoic acid 10 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 55 minutes, and the time required for the two pound gallon solution was 25 minutes.
Example 10 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingreclients):
Sodium hydroxide 85 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 2,4-dichlorobenzoic acid 5 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 65 minutes, and the time required for the two pound per gallon solution was 16 minutes.
Example 11 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingreclients):
Sodium hydroxide 80 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 2,4-dichlorobenzoic acid 10 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 48 minutes, and the time required for the two pound per gallon solution was 8 minutes.
Example 12 A steel panel, coated in accordance with the specifications of Example 7, was partially submerged in a beaker containing a two pound per gallon concentration in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide 75 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 2,4-dichlorobenzoic acid 15 Total 100 The paint coating was completely stripped from the submerged portion of the panel in six minutes.
Example 13 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide 85 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 3,4-dichlorobenzoic acid 5 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 40 minutes, and the time required for the two pound per gallon solution was 10* minutes.
Example 14 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide Sodium gluconate 8 Sodium dodecyldiphenyloxide' disulfonate 2 3,4-dichlorobenzoic acid 10 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 33 minutes, :and the time required for the two pound per gallon solution was 6 minutes.
Example 15 A steel panel, coated in accordance with the specifications of Example 7, was partially submerged in a beaker containing a two pound per gallon concentration in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredient-s) Sodium hydroxide 75 Sodium gluconate 8 Sodium dodecyldiphenyloxide disul'fonate 2 3,4dichlor0benzoic acid 15 Total 100 The paint coating was completely stripped from the submerged portion of the panel in five minutes.
Example 16 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Potassium hydroxide Sodium gluconate 8 Sodium dode-cyldiphenyloxide disulfonate 2 2,4-dichlorophenoxyacetic acid 5 Total The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 60 minutes, and the time required for the two pound per gallon solution was 10 minutes.
Example 17 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as pencent by weight of the undissolved ingredients):
Potassium hydroxide 80 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 2,4-dichlorophenoxyacetic acid 10 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 60 minutes, and the time required for the two pound per gallon solution was 6 minutes.
Example 18 A steel panel, coated in accordance with the specifications of Example 7, was partially submerged in a beaker containing a two pound per gallon concentration in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Potassium hydroxide 75 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 2,4-dichlorophenoxyacetic acid Total 100 The paint coating was completely stripped from the submerged portion of the panel in five minutes.
Example 19 Potassium hydroxide 85 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 2,4,5-tri-chlorophenoxyacetic acid 1 5 Total 100 1 Max. solubility 2-3 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 55 minutes, and the time required for the two pound per gallon solution was 25 minutes.
Example 20 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide 85 Sodium gluconate 8 Sodium dodecyldiphenyloxide disu-lfonate 2 p-Chlorobenzenesulfonic acid 5 Total 100 E5 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 63 minutes, and the time required for the two pound per gallon solution was 20 minutes.
Example 21 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the fol-lowing composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 p-Chlorobenzenesulfonic acid 10 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 32 minutes, and the time required for the two pound per gallon solution was 16 minutes.
Example 22 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide Sodium gluconate 8 Sodium dodecyldiphenyl-oxide disulfonate 2 2-chloro-S-nitrobenzenesulfonic acid 5 Total The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 60 minutes, and the time required for the two pound per gallon solution was 35 minutes.
Example 23 Two steel panels, coated in accordance with the specifications of Example 7, were partially submerged in beakers containing respectively one and two pound per gallon concentrations in water of a boiling stripping composition having the following composition (parts being expressed as percent by weight of the undissolved ingredients):
Sodium hydroxide 80 Sodium gluconate 8 Sodium dodecyldiphenyloxide disulfonate 2 2-chloro-S-n-itrobenzenesulfonic acid 10 Total 100 The time required to completely strip the paint coating from the submerged portion of the panel in the beaker containing the one pound per gallon solution was 50 minutes, and the time required for the two pound per gallon solution was 19 minutes.
The halogenated organic acids utilized in the compositions of this invention are preferably added at a concentration of about ten percent solids, although a range of from about five to about fifteen percent solids is effective, and concentrations above about fifteen percent solids effective but not currently economically feasible.
Having thus described our invention, we claim:
1. A solid paint stripping composition for use in dilute aqueous solution consisting essentially of a major amount of a caustic alkali metal compound selected from the class consisting of sodium and potassium hydroxide, and an amount in the range of from about five percent by Weight to about forty percent by weight of a halogenated organic acid compound selected from the group consisting of the halogenated aromatic carboxylic acids having the general formula X-Ar-COOH, where X represents a ring substituted halogen radical upon Ar, which represents a phenyl radical; the halogenated aromatic sulfonic acids having the general formula X-Ar-SO H, where X represents a radical selected from the group consisting of monoand poly-ring substituted halogen radical upon Ar, which represents a phenyl radical; the halogenated nitro substituted sulfonic acids having the general formula where X represents a radical selected from the group consisting of monoand poly-ring substituted halogen radical upon Ar, which represents a phenyl radical; and a halogenated aromatic-aliphatic ether compound selected from the class consisting of 2,4-dichlorophenoxyacetic acid and 2,4,S-trichlorophenoxyacetic acid.
2. The composition of claim 1 wherein the halogenated organic acid compound is p chlorobenzoic acid.
3. The composition of claim 1 wherein the halogenated organic acid compound is 2,4-dichilorobenzoic acid.
4. The composition of claim 1 wherein the halogenated organic acid compound is 3,4-dichlorobenzoic acid.
5. The composition of claim 1 wherein the halogenated organic acid compound is 2,4-dichlorophenoxyacetic acid.
6. The composition of claim 1 wherein the halogenated References Cited by the Examiner UNITED STATES PATENTS 1,095,793 5/1914 Bohn 252-156 1,742,347 1/ 1930 Fries 252-143 2,314,285 3/1943 Morgan 252-156 XR 2,962,395 11/1960 Brown 252- 156 XR 2,969,328 1/1961 Ellenson et -al 252-153 2,971,918 2/196 1 Goldsmith et a1. 252-156 XR 2,975,140 3/1961 Yaroch 252-156 XR 3,027,223 3/1962 Teot 252-156 XR 3,106,929 10/1963 Friedrich 134-38 3,203,787 8/1965 Grunwold 252-156 XR OTHER REFERENCES The Condensed Chem. Dict., Reinhold Publ. Corp., 6th ed., 1961, pp. 332 and 1162 relied on.
LEON D. ROSDOL, Primary Examiner.
ALBERT T. MEYERS, JULIUS GREENWALD,
Examiners.
W. E. SCHULZ, Assistant Examiner.

Claims (1)

1. A SOLID PAINT STRIPPING COMPOSITION FOR USE IN DILUTE AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF A MAJOR AMOUNT OF A CAUSTIC ALKALI METAL COMPOUND SELECTED FROM THE CLASS CONSISTING OF SODIUM AND POTASSIUM HYDROXIDE, AND AN AMOUNT IN THE RANGE OF FROM ABOUT FIVE PERCENT BY WEIGHT TO ABOUT FORTY PERCENT BY WEIGHT OF A HALOGENATED ORGANIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE HALOGENATED AROMATIC CARBOXYLIC ACIDS HAVING THE GENERAL FORMULA X-AR-COOH, WHERE X REPRESENTS A RING SUBSTITUTED HALOGEN RADICAL UPON AR, WHICH REPRESENTS A PHENYL RADICAL; THE HALOGENATED AROMATIC SULFONIC ACIDS HAVING THE GENERAL FORMULA X-AR-SO3H, WHERE X REPRESENTS A RADICAL SELECTED FROM THE GROUP CONSISTING OF MONO- AND POLY-RING SUBSTITUTED HALOGEN RADICAL UPON AR, WHICH REPRESENTS A PHENYL RADICAL; THE HALOGENATED NITRO SUBSTITUTED SULFONIC ACIDS HAVING THE GENERAL FORMULA X-AR(-NO2)-SO3-H WHERE X REPRESENTS A RADICAL SELECTED FROM THE GROUP CONSISTING OF MONO- AND POLY-RING SUBSTITUTED HALOGEN RADICAL UPON AR, WHICH REPRESENTS A PHENYL RADICAL; AND A HALOGENERATED AROMATIC-ALIPHATIC ETHER COMPOUND SELECTED FROM THE CLASS CONSISTING OF 2,4-DICHLOROPHENOXYACETIC ACID AND 2,4,5-TRICHLOROPHENOXYACETIC ACID.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4125476A (en) * 1977-03-10 1978-11-14 Dean Ralph R Paint spray booth composition
WO2014190348A1 (en) * 2013-05-24 2014-11-27 Enthone Inc. Aqueous stripping composition for metal surfaces

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1095793A (en) * 1909-01-27 1914-05-05 Basf Ag Composition of matter suitable for bucking.
US1742347A (en) * 1926-02-23 1930-01-07 Studebaker Corp Art of removing varnish and enamel coatings
US2314285A (en) * 1938-03-30 1943-03-16 Allied Chem & Dye Corp Cleaning metal surfaces
US2962395A (en) * 1960-11-29 Paint stripping method and composition
US2969328A (en) * 1957-06-20 1961-01-24 Ellenson Evelyn Composition for removing coatings
US2971918A (en) * 1957-01-07 1961-02-14 Solventol Chemical Products In Paint stripper composition
US2975140A (en) * 1954-07-27 1961-03-14 Klem Chemicals Inc Organic finish remover and method
US3027223A (en) * 1957-12-11 1962-03-27 Dow Chemical Co Caustic mercerizing solutions
US3106929A (en) * 1960-09-26 1963-10-15 Vincent W Jones Process for stripping paints
US3203787A (en) * 1961-11-01 1965-08-31 Macdermid Inc Method of and composition for chemically dissolving electroless metal deposits

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2962395A (en) * 1960-11-29 Paint stripping method and composition
US1095793A (en) * 1909-01-27 1914-05-05 Basf Ag Composition of matter suitable for bucking.
US1742347A (en) * 1926-02-23 1930-01-07 Studebaker Corp Art of removing varnish and enamel coatings
US2314285A (en) * 1938-03-30 1943-03-16 Allied Chem & Dye Corp Cleaning metal surfaces
US2975140A (en) * 1954-07-27 1961-03-14 Klem Chemicals Inc Organic finish remover and method
US2971918A (en) * 1957-01-07 1961-02-14 Solventol Chemical Products In Paint stripper composition
US2969328A (en) * 1957-06-20 1961-01-24 Ellenson Evelyn Composition for removing coatings
US3027223A (en) * 1957-12-11 1962-03-27 Dow Chemical Co Caustic mercerizing solutions
US3106929A (en) * 1960-09-26 1963-10-15 Vincent W Jones Process for stripping paints
US3203787A (en) * 1961-11-01 1965-08-31 Macdermid Inc Method of and composition for chemically dissolving electroless metal deposits

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4125476A (en) * 1977-03-10 1978-11-14 Dean Ralph R Paint spray booth composition
WO2014190348A1 (en) * 2013-05-24 2014-11-27 Enthone Inc. Aqueous stripping composition for metal surfaces
US9834689B2 (en) 2013-05-24 2017-12-05 Enthone Inc. Aqueous stripping composition for metal surfaces

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